Question: What kingdom starts with the letter "z"?
Paraphrase: What kingdom does the letter "z" begin with.
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q417175 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'z')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
Answer: Zakhara, Zakhara, Zhangzhung, Zhangzhung, Zamorin of Calicut, Zamorin of Calicut